The Rebis from the Latin 'res bina', meaning dual or double matter. When the alchemist has achieved a high stage of integration, soul and spirit combine to form the rebis-one thing and one matter. The mineral spirit rough like water mixes itself with its bodies in the first brew in the process of dissolving.
In this picture we see the alchemist as double matter, a figure integrating masculine and feminine energies. The male side is holding a mirror as a reference to looking inside of yourself while the female side of the figure is holding the philosophical egg. In this egg, the alchemist is mirroring the biological stages of his physical birth. This picture then depicts his involution into consciousness. He has given wings to the earthen reality upon which he stands - he literally 'understands' life with Gnosis wisdom.